And here:
http://www.linuxnetworks.de/doc/index.php/OpenDBX/C_API/Usage I can read:
"
Processing results
After fetching a row, all values of this row are available for
further processing, as well as their name, length and type - but the
name and the type of a column won't change. Also the number of columns
returned by odbx_column_count() is fixed for the whole result.
int i;
for( i = 0; i < odbx_column_count( result ); i++ )
{
fprintf( stdout, "Name: %s\n", odbx_column_name( result, i ) );
fprintf( stdout, "Type: %d\n", odbx_column_type( result, i ) );
fprintf( stdout, "Length: %d\n", odbx_field_length( result, i ) );
fprintf( stdout, "Value: %s\n", odbx_field_value( result, i ) );
}
Besides odbx_column_type() these functions don't return error codes. Instead, they return zero (odbx_field_length()) or NULL (odbx_column_name() and odbx_field_length()), but you shouldn't check for those because these values are also valid return values.
All numbers are returned as strings from the database regardless
if they are integers or floats. If you want to do arithmetic operations,
you have to convert them to their machine dependent binary
representation first.
"
On Mon, Aug 15, 2011 at 11:11 PM, Mariano Martinez Peck
<[hidden email]> wrote:
On Mon, Aug 15, 2011 at 9:59 PM, Alain Rastoul
<[hidden email]> wrote:
Hi,
I finally found that when called in C with the same
api calls that those made by opendbx, sqlite correctly returns datatype of
columns when fetching rows, the problem is clearly that the data type is stored
in SQueakDBX column description for the resultset the first time it
fetches the first row.
For sqlite, squeakdbx should call the sqlite api to
retrieve column datatype for each row and each colum while fetching
data.
Hi Alain. I am reading this:
http://www.linuxnetworks.de/doc/index.php/OpenDBX/C_API/odbx_column_type
From SqueakDBX, we send odbx_column_type ONCE PER RESULTSET.
You can see this in #processNextResultSet:querySettings: that for every resultset it sends #processResultWithRows:resultHandle:querySettings:
Now.... should we send odbx_column_type and friends ONCE PER RAW? As far as I can see, in other databases we don't need to do that. But maybe we are wrong and you are right.
Norbert?
Anyway, if you want to give it a try to Sqlite, what about overwrite #moveNext: in SqlitePlatform and do something to set the new type for every raw.
From what I can see, if the type depends on each raw and it should be asked for every raw, then a design change is needed so that we can move the description from the REsultSet to the Raw :)
But it may have implications I don't know.
Perhaps squeakDbx could get only true object values (are rawValues really
needed) ?.
Well, it depends on the user needs. Now, a key point is what GLORP should use.
Or perhaps another solution would be to call the
sqlite api if the stored datatype is UNKNOWN in column description ... (only for
sqlite, but sounds like a bad trick)
sounds like a hask, but if it works it is at least a valid workaround.
I am perplexed ...
Any idea is welcome
Cheers
Alain
On Sat, Aug 13, 2011 at 12:06 AM, Alain Rastoul
<[hidden email]>
wrote:
It doen't work.
Howerver googling for opendbx msg00483, I
found
yes, that one :)
it seems to be the problem of the issue 10, and
I think the same problem I have..
yes
Sorry, I cannot do more.... :(
Strange that it doesn't work with MSSQL
too..
On Fri, Aug 12, 2011 at 11:14 PM, Alain Rastoul
<[hidden email]>
wrote:
I used
the following script (about 2 months ago I think ) in Pharo
1.3
"SqueakDBX"
Gofer new squeaksource:
'MetacelloRepository';
package:
'ConfigurationOfSqueakDBX';
load.
ConfigurationOfSqueakDBX project
latestVersion load.
"GLORP"
Gofer new squeaksource:
'MetacelloRepository';
package:
'ConfigurationOfGlorpDBX';
load.
ConfigurationOfGlorpDBX project
latestVersion load.
Yes, you are using SqueakDBX ;) you will move
soon to DBXTalk :)
II use DBXTestCase for my test with
the code I send in my email (is it ok for
you?), but I will have alook at DBXQueryTest too.
No problem to put
it in the test suite - it makes me remember that I
still didn't send my license
agreement to Stephane but I will do it asap... I hate papers
;-)
in
our case we don't need that ;)
--
Mariano
http://marianopeck.wordpress.com
Locked
DBXNulls.3.cs (2K)